From left to right:
Mark Swift "Swifty" : Keyboards
Billy Bongo : Percussion
Dave Brons : Guitar (bass here though)
Paul Bielatowicz : Guitar
Tony Howarth : Drums
Gary Skelton : Lead vocals & Bass *
* - Gary doesn't appear in this picture as the song being played is 'For The Love of God' - an instrumental by Steve Vai.
The strange looking guy sat in front of the stage is the band's 'official' photographer - Jona Jacob.